This is one of the best and easiest sandwich ideas. I promise you will love it.
Here's what you need:
9 tablespoons of butter (divided)
16 oz mushrooms
horseradish or horseradish sauce
Start with 4 onions and caramelize with 3 tablespoons of butter.
Caramelizing is easy. Melt the butter in a pan and add the onions. Cover for about 30 minutes stirring occasionally.
In another skillet, saute one pound of butter in 6 tablespoons of butter.
Grill a two strip steak to medium rare.
Let them rest for about 15 minutes. They've been working hard and need this extra time to themselves.
Then slice into thin pieces.
Add the steak and mushrooms to the onions along with 1 Tablespoon of Soy Sauce. Mix them all together.
Next up, The Bread. I use sub rolls, you could use crusty french bread or whatever you like. Slice them enough to open up but not all the way through. Put them on a foil lined baking sheet and turn the broiler on.
Smear a little horseradish or horseradish sauce on each bun. Remember a little goes a long way and it want it to compliment the steak not overtake it.
Now load them up. Fill each bun with the steak, onion and mushroom mixture and top with swiss cheese.
You want alot of meat in each one. This is really a meal than a sandwich. Now that you are completely hungry and ready to eat. Put them in the broiler for about 5 minutes. This will melt that wonderful cheese and get the buns all toasty. Yummy.
You can cut them in half and have them as a meal or I have cut each one into 4 pieces to serve at parties. And they are great as leftovers the next day.